Artificial asm



T. BURGAN ARTIFICIAL ARM Filed Un t. 18. 1922 Elm: 900

.ToaZZ whom it may concern: 1

Patented Aug. 14, 1923.

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'rnoivms Bunsen; or" PLAINS ran-sons, rninvsrtvrinta.

anrrrrcrer. ARM.

1 Application filed October s; 1922. seriaiiroiseasoe.

['Be it'kn'own thatI, THOMAS BURGA a l citizen of the United States, residing at Plains Parsons, in the county of Luzerne andState of Pennsylvania, have invented a new and useful Artificial Arm, of which the following is aspecific'ationj This inventionrelates to an artificial arm especially designed for use on an arm having a forearm stump. l

One of the objects of the invention is to provide a simple and durable structure the wrist and hand portion of which can be turned readily by the stump, there being a special connection between the hand portion V and the attaching band of the arm whereby the fingers of the hand can be moved toward or from the thumb for the purpose of properly grasping an object.

With the foregoing and other objects'in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter" described andclaimed, it being understood that, withinthe'scope of what is claimed,

changes in the precise embodiment of the invention shown can be made without debeing shown in elevation.

Figure 3 is an enlarged section on line 33, Figure 1.

Referring to the/figures by characters of reference 1 designates an. elongated frustoconical stump receiving member in the small endof which'is secured the wrist portion'2 of an artificial hand 3; In the structure shown this hand has a rigid thumb 4 while a finger section 5 is hingedly connected to the hand as shown at 6, this finger section being in one piece. Abroad strap 7 of sheet rubber is attached'to the backof the handB and finger section 5 and serves to bridge the space between the hand and finger'section and also to hold the finger sec tion normally swung back away from the mounted for rotation within a metal sleeve thumb. The stump receiving section 1 is having straps 9 secured to opposed portions thereof and provided with buckles 10. Thus by tightening the strap the sleeve 8 can be caused to fit snugly onthe stump receiving member 1. An annular flange 10 is preferably formed on the large end of the member 1 for hearing against'the end of the sleeve 8 and for presentinga smooth surface to the stump. The small end of the sleeve 8 is preferably surrounded by a collar 11 so as to hold the sleeve properly assembled with the wrist engaging portionof the member'l. i

Secured to the sides of the sleeve 8 are metal straps 12 pivotally connected, as at 13, to metal straps 14: secured to opposed-- which projects beyond the band and is connected by a rubber or elastic strap 18 to a buckle 19. A strap 20 is adjustably secured to the buckle and extends longitudinally within the member 1, this strap being connected to a cord 22 which works freely in an opening 23 extending through the wrist portion 2 and through the hand 3; The outer end of the cord is attached to the finger portion 5.

In using the artificial arm the forearm stump is fitted snugly in the member 1 and the elbow will bear against the elastic strap 18. The band 15 is laced tightly about the upper arm close to the elbow and the parts are then ready for use. By manipulating the stump the arm can be swung at the elbow joint. During this operation the clastic strap 18 will press against the elbow of the stump and cause strap 20 to pull on the cord 22. Consequently the finger portion 5 will be swung toward thethumb 4,-this resulting in the elongation of the strap 7. As soon as the arm is straightened out the finger portion will move away from the thumb, this action being produced by the contracting strap 7. By turning the forearm stump the member 1 will be caused to rotate within the sleeve 8 and thus pro-.

duce a rotation of the hand 3.

It will be seen that the device is very light, durable and compact and can be easily applied and removed.

What is claimed is V 1. A11 artificial arm comprising an attach- :hold the tubular member against With.-

ing portion for engaging the upper arniot' a stump, a sleeve split longitudinally, a hinge connection between the 'sleeve and the attaching portion," a tapered tubular member embraced by the sleeve for receiving the fore arm portion of the stump, a hand por tion fixedly connected to andmovable with the small end of the tubular member and cooperating with the end of the sleeve to drawal in one direction from the sleeve, and flexible means embracing the sleeve for con.- tractinlg upon the tubular member to hold said member against rotation Within the sleeve. V r r 2. An artificial arm comprising an attaching portion for engaging the upper-arm of a stamp, a sleeve split longitudinally, a hinge connection between the sleeve and the attaching portion, a taperedtubular member embraced by the sleeve for receiving the fore arm portion of the stump, a hand portion fixedly connectedto and movable with the smallend oi"- the tubular member and cooperating with the end of the sleeve to hold the tubular member against Withdrawal in one direction from the sleeve, and flexible means embracing the sleeve for contracting upon the tubularmember tohold saidnmember against rotation within the sleeve a finger hingedly' connected to the hand; yielding means for holding the finger portion normally extended outwardly fromi the hand portion, and an elastic connection between the linger portion and the attaching portion, said connection being extended through the tubularportion and including a broad elbow engaging portion;

In testimony that I claim the'foregoing as my own, I'have hereto afiixed my signature in the presence of two Witnesses.

THQMAS Bone-en;

YVitnesses: V

JAMES P. D NNELLY,

DAVID WALTERS. 

